Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-mmc
[linux-2.6] / drivers / pci / pcie / aer / aerdrv_acpi.c
1 /*
2  * Access ACPI _OSC method
3  *
4  * Copyright (C) 2006 Intel Corp.
5  *      Tom Long Nguyen (tom.l.nguyen@intel.com)
6  *      Zhang Yanmin (yanmin.zhang@intel.com)
7  *
8  */
9
10 #include <linux/module.h>
11 #include <linux/pci.h>
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/pm.h>
15 #include <linux/suspend.h>
16 #include <linux/acpi.h>
17 #include <linux/pci-acpi.h>
18 #include <linux/delay.h>
19 #include "aerdrv.h"
20
21 /**
22  * aer_osc_setup - run ACPI _OSC method
23  *
24  * Return:
25  *      Zero if success. Nonzero for otherwise.
26  *
27  * Invoked when PCIE bus loads AER service driver. To avoid conflict with
28  * BIOS AER support requires BIOS to yield AER control to OS native driver.
29  **/
30 int aer_osc_setup(struct pci_dev *dev)
31 {
32         int retval = OSC_METHOD_RUN_SUCCESS;
33         acpi_status status;
34         acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
35         struct pci_dev *pdev = dev;
36         struct pci_bus *parent;
37
38         while (!handle) {
39                 if (!pdev || !pdev->bus->parent)
40                         break;
41                 parent = pdev->bus->parent;
42                 if (!parent->self)
43                         /* Parent must be a host bridge */
44                         handle = acpi_get_pci_rootbridge_handle(
45                                         pci_domain_nr(parent),
46                                         parent->number);
47                 else
48                         handle = DEVICE_ACPI_HANDLE(
49                                         &(parent->self->dev));
50                 pdev = parent->self;
51         }
52
53         if (!handle)
54                 return OSC_METHOD_NOT_SUPPORTED;
55
56         pci_osc_support_set(OSC_EXT_PCI_CONFIG_SUPPORT);
57         status = pci_osc_control_set(handle, OSC_PCI_EXPRESS_AER_CONTROL |
58                 OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
59         if (ACPI_FAILURE(status)) {
60                 if (status == AE_SUPPORT)
61                         retval = OSC_METHOD_NOT_SUPPORTED;
62                 else
63                         retval = OSC_METHOD_RUN_FAILURE;
64         }
65
66         return retval;
67 }
68